ISSN 2096-4498 CN 44-1745/U
隧道建设(中英文) ›› 2016, Vol. 36 ›› Issue (2): 158-163.DOI: 10.3973/j.issn.1672-741X.2016.02.006
• 研究与探索 • 上一篇 下一篇
王正兴, 施 焱
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WANG Zhengxing, SHI Yan
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摘要:
为研究隧道施工条件下土层的沉降规律,利用离散元软件PFC2D,建立隧道-土体颗粒流数值模型,模拟砂土地层隧道施工过程中的土层沉降。研究结果表明: 通过设计,颗粒流方法可有效模拟隧道施工的开挖问题;土拱效应的发挥程度与地层损失率成正比,同时土层剪应变率呈现由隧道中轴线向两侧逐渐减小、由深层向浅层逐渐展开的分布规律。分析结果可为工程实践中分析砂土地层隧道施工引起的土体沉降规律提供理论依据。
关键词: 砂土地层, 隧道施工, 沉降, 颗粒流模拟, 土拱效应, 地层损失率
Abstract:
A numerical model of tunnelsoil is established by means of PFC2D (Particle Flow Code) discrete element software, so as to simulate the ground settlement induced by tunneling. The study results show that: 1) The PFC2D can be considered as an effective way to simulate the tunnel excavation. 2) The effect of soil arch is proportional to the ground loss. 3) The shear strain rate of sandy strata decreases gradually from the medial axis to the side and increases gradually from deep soil to shallow soil during tunneling. The analysis results can provide theoretical reference for study on ground settlement induced by tunneling in sandy strata.
Key words: sand strata, tunneling, settlement, PFC2D, soil arching effect, ground loss rate
中图分类号:
U 455
王正兴, 施 焱. 砂土地层中隧道施工引起土层沉降的颗粒流模拟研究[J]. 隧道建设, 2016, 36(2): 158-163.
WANG Zhengxing, SHI Yan. Study on Ground Settlement Induced by Tunneling in Sandy Strata Using PFC2D[J]. Tunnel Construction, 2016, 36(2): 158-163.
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